public abstract class Card extends Object{
    
    private String username;
    private String password;
    
    public void setUsername(String username){
        this.username =  username;
    };
    public String getUsername(){
        return this.username;
    };
    public void setPassword(String password){
        this.password =  password;
    };
    public String getPassword(){
        return this.password;
    };
    
    public void login(){};    
    public void withdraw(){};    
    //call function is till not finished
}